getblocktemplate failure on startup due to bad txFees/sigOps structs

[cjepson]

getblocktemplate fails when generating new work from an old block found in the blockchain in the absence of a cached template. This is caused by a bad declaration in mining.go.

fees: []int64{0}, sigOpCounts: []int64{0},

This can be fixed by calculating the fees and sigop number for these transactions.

[jolan]

Was starting to look into this and on testnet I just get -32603: race in block template data for getwork caused corruption over and over again.

getblocktemplate isn't used by anyone or anything as far as I know. Do we still want to fix it up?

[marcopeereboom]

Gated by: #130

[davecgh]

This is no longer relevant. The getblocktemplate call has since been disabled and any remaining issues will certainly be fixed when the mining code is redone. Closing.